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Wed, 13 Dec 2023 10:53:49 -0700 From: To: , , CC: , , , , , , , , , , , , , Ravi Jonnalagadda Subject: [PATCH 1/2] base/node: Add sysfs for memtier_override Date: Wed, 13 Dec 2023 23:23:28 +0530 Message-ID: <20231213175329.594-2-sthanneeru.opensrc@micron.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231213175329.594-1-sthanneeru.opensrc@micron.com> References: <20231213175329.594-1-sthanneeru.opensrc@micron.com> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MT-Whitelisted: matched X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF0001AB54:EE_|CO6PR08MB7769:EE_ X-MS-Office365-Filtering-Correlation-Id: 4b99d33b-3297-4022-6904-08dbfc047ad1 X-LD-Processed: f38a5ecd-2813-4862-b11b-ac1d563c806f,ExtAddr X-EXT-ByPass: 1 X-MT-RULE-Whitelisted: Triggered X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:137.201.242.130;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.micron.com;PTR:masquerade.micron.com;CAT:NONE;SFS:(13230031)(4636009)(346002)(376002)(396003)(39860400002)(136003)(230922051799003)(451199024)(64100799003)(1800799012)(186009)(82310400011)(46966006)(36840700001)(40470700004)(40460700003)(26005)(6286002)(107886003)(2616005)(1076003)(336012)(426003)(7696005)(6666004)(47076005)(36860700001)(83380400001)(5660300002)(41300700001)(2906002)(2876002)(478600001)(110136005)(8676002)(8936002)(4326008)(70206006)(70586007)(316002)(54906003)(7636003)(82740400003)(86362001)(356005)(36756003)(55016003)(40480700001)(2101003);DIR:OUT;SFP:1101; X-OriginatorOrg: micron.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Dec 2023 17:53:57.2263 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4b99d33b-3297-4022-6904-08dbfc047ad1 X-MS-Exchange-CrossTenant-Id: f38a5ecd-2813-4862-b11b-ac1d563c806f X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f38a5ecd-2813-4862-b11b-ac1d563c806f;Ip=[137.201.242.130];Helo=[mail.micron.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF0001AB54.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO6PR08MB7769 From: Srinivasulu Thanneeru This patch introduces a new memtier_override sysfs. memtier_override is the current memory tier of the node. To migrate, replace it with the id of the desired memory tier. adistance_offset is the required offset from memtype to move the node to the target memory tier(i.e, memtier_override). Signed-off-by: Srinivasulu Thanneeru Signed-off-by: Ravi Jonnalagadda --- Documentation/ABI/stable/sysfs-devices-node | 7 ++++ drivers/base/node.c | 41 +++++++++++++++++++++ include/linux/memory-tiers.h | 6 +++ include/linux/node.h | 6 +++ mm/memory-tiers.c | 19 +++++++++- 5 files changed, 78 insertions(+), 1 deletion(-) diff --git a/Documentation/ABI/stable/sysfs-devices-node b/Documentation/ABI/stable/sysfs-devices-node index 402af4b2b905..447a599cc536 100644 --- a/Documentation/ABI/stable/sysfs-devices-node +++ b/Documentation/ABI/stable/sysfs-devices-node @@ -70,6 +70,13 @@ Description: Distance between the node and all the other nodes in the system. +What: /sys/devices/system/node/nodeX/memtier_overwrite +Date: December 2023 +Contact: Srinivasulu Thanneeru +Description: + The current memory tier of the node. + To migrate, replace it with the id of the desired memory tier. + What: /sys/devices/system/node/nodeX/vmstat Date: October 2002 Contact: Linux Memory Management list diff --git a/drivers/base/node.c b/drivers/base/node.c index 493d533f8375..788176b3585a 100644 --- a/drivers/base/node.c +++ b/drivers/base/node.c @@ -7,6 +7,7 @@ #include #include #include +#include #include #include #include @@ -569,11 +570,49 @@ static ssize_t node_read_distance(struct device *dev, } static DEVICE_ATTR(distance, 0444, node_read_distance, NULL); +static ssize_t memtier_override_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int nid = dev->id; + int len = 0; + + len += sysfs_emit(buf, "memory_tier%d\n", node_devices[nid]->memtier); + return len; +} + +static ssize_t memtier_override_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + int nid = dev->id; + int ret, memtier; + + ret = kstrtoint(buf, 0, &memtier); + + if (ret) + return ret; + if (memtier < 0 || memtier > MAX_MEMTIERID) + return -EINVAL; + if (node_devices[nid]->memtier == memtier) + return size; + ret = get_memtier_adistance_offset(nid, memtier); + node_devices[nid]->adistance_offset = ret; + + return size; +} +static DEVICE_ATTR_RW(memtier_override); + +void set_node_memtierid(int node, int memtierid) +{ + node_devices[node]->memtier = memtierid; +} + static struct attribute *node_dev_attrs[] = { &dev_attr_meminfo.attr, &dev_attr_numastat.attr, &dev_attr_distance.attr, &dev_attr_vmstat.attr, + &dev_attr_memtier_override.attr, NULL }; @@ -883,6 +922,8 @@ int __register_one_node(int nid) INIT_LIST_HEAD(&node_devices[nid]->access_list); node_init_caches(nid); + node_devices[nid]->memtier = 0; + node_devices[nid]->adistance_offset = 0; return error; } diff --git a/include/linux/memory-tiers.h b/include/linux/memory-tiers.h index 1e39d27bee41..0dba8027e785 100644 --- a/include/linux/memory-tiers.h +++ b/include/linux/memory-tiers.h @@ -20,6 +20,11 @@ */ #define MEMTIER_ADISTANCE_DRAM ((4 * MEMTIER_CHUNK_SIZE) + (MEMTIER_CHUNK_SIZE >> 1)) +/* + * Memory tier id is derived from abstract distance(signed 32bits) + */ +#define MAX_MEMTIERID (0xFFFFFFFF >> (MEMTIER_CHUNK_BITS + 1)) + struct memory_tier; struct memory_dev_type { /* list of memory types that are part of same tier as this type */ @@ -48,6 +53,7 @@ int mt_calc_adistance(int node, int *adist); int mt_set_default_dram_perf(int nid, struct node_hmem_attrs *perf, const char *source); int mt_perf_to_adistance(struct node_hmem_attrs *perf, int *adist); +int get_memtier_adistance_offset(int node, int memtier); #ifdef CONFIG_MIGRATION int next_demotion_node(int node); void node_get_allowed_targets(pg_data_t *pgdat, nodemask_t *targets); diff --git a/include/linux/node.h b/include/linux/node.h index 427a5975cf40..1c4f4be39db4 100644 --- a/include/linux/node.h +++ b/include/linux/node.h @@ -83,6 +83,8 @@ static inline void node_set_perf_attrs(unsigned int nid, struct node { struct device dev; struct list_head access_list; + int memtier; + int adistance_offset; #ifdef CONFIG_HMEM_REPORTING struct list_head cache_attrs; struct device *cache_dev; @@ -138,6 +140,7 @@ extern void unregister_memory_block_under_nodes(struct memory_block *mem_blk); extern int register_memory_node_under_compute_node(unsigned int mem_nid, unsigned int cpu_nid, unsigned access); +extern void set_node_memtierid(int node, int memtierid); #else static inline void node_dev_init(void) { @@ -165,6 +168,9 @@ static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) static inline void unregister_memory_block_under_nodes(struct memory_block *mem_blk) { } +static inline void set_node_memtierid(int node, int memtierid) +{ +} #endif #define to_node(device) container_of(device, struct node, dev) diff --git a/mm/memory-tiers.c b/mm/memory-tiers.c index 8d5291add2bc..31ed3c577836 100644 --- a/mm/memory-tiers.c +++ b/mm/memory-tiers.c @@ -167,6 +167,21 @@ static const struct attribute_group *memtier_dev_groups[] = { NULL }; +int get_memtier_adistance_offset(int node, int memtier) +{ + struct memory_dev_type *memtype; + int adistance_offset; + + memtype = node_memory_types[node].memtype; + /* + * Calculate the adistance offset required from memtype + * to move node to target memory tier. + */ + adistance_offset = (memtier << MEMTIER_CHUNK_BITS) - + memtype->adistance; + return adistance_offset; +} + static struct memory_tier *find_create_memory_tier(struct memory_dev_type *memtype) { int ret; @@ -497,8 +512,10 @@ static struct memory_tier *set_node_memory_tier(int node) memtype = node_memory_types[node].memtype; node_set(node, memtype->nodes); memtier = find_create_memory_tier(memtype); - if (!IS_ERR(memtier)) + if (!IS_ERR(memtier)) { rcu_assign_pointer(pgdat->memtier, memtier); + set_node_memtierid(node, memtier->dev.id); + } return memtier; }